What do you guys think of tricks that are completely mathematical, but appear to use no math whatsoever? Also, do you guys like using math in a card trick (specifically, are you guys ok with doing mental math in a card trick)? I'm only asking because there is a card effect I've been experimenting with that uses some "heavy" mental math (as far as modern card magic is concerned), but the effect in itself ends up looking like a complete coincidence, no math at all.